Fatima – What is Sound?

Write down – What is Sound?


Sound is an energy made by vibration. When an object vibrates 

It causes movement around the area. It could travel. Any sound 

With the frequency below  20 HZ is called Infrasound and any sound 

With the frequency above 20,000 HZ is called Ultrasound when something vibrates one of the paths leading to our air molecules bump into the second path of our air molecules.


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